SMI West (Smoke Management Instructions) Western Oregon Smoke Management Instructions

Mon Apr 26 16:05:48 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Monday, April 26, 2010       2:30 PM      Jim Little

1.  DISCUSSION AND FORECAST FOR THE WESTERN OREGON AREA FORECAST ZONES 601-623

    TUESDAY

A deep trough extends from the Gulf of Alaska southeastward to Oregon.  The cold front that moved into western Oregon Monday sweeps across eastern Oregon.  Post frontal showers continue in western Oregon with temperatures on the cool side.  The air mass will be quite unstable and maximum mixing heights will go above 5000 feet for good smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

Showery weather continues Wednesday across the region.  The air mass will be cool enough for snow down to about 2500 feet Wednesday morning. The upper trough weakens but periodic impulses move NNW to SSE across the state to keep showers going into Friday.  Maximum mixing heights should reach 5000 feet plus throughout the outlook period for good smoke dispersal conditions.

2.  DISPERSION

Zone 601, 602, 603 and 612 (North Coast Range):

MORNING
Mixing height 4100 - 5000 ft.
Transport wind SSW to WSW at 12 - 24 mph.
Surface wind SSW to WSW at 10 - 16 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind similar to morning.
Surface wind SSW to WSW at 10 - 16 mph.

EVENING
Mixing height 2100 - 3100 ft.
Transport wind SW to W at 12 - 22 mph.
Surface wind SW to W at 6 - 12 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height 1700 - 2700 ft.
Transport wind S to SW at 8 - 14 mph.
Surface wind S to SW at 8 - 14 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind increases to SSW to SW at 12 - 22 mph.
Surface wind SSW to SW at 10 - 22 mph.

EVENING
Mixing height 1700 - 2700 ft.
Transport wind SSW to WSW at 10 - 18 mph.
Surface wind SSW to WSW at 10 - 16 mph.

Zone 615-620 (South Coast Range):

MORNING
Mixing height 2600 - 3600 ft.
Transport wind SSW to SW at 10 - 16 mph.
Surface wind SSW to SW at 8 - 12 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind SW to WSW at 10 - 18 mph.
Surface wind SW to WSW at 9 - 15 mph.

EVENING
Mixing height 3100 - 4100 ft.
Transport wind SW to WSW at 10 - 18 mph.
Surface wind SW to WSW at 9 - 15 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height 1800 - 2800 ft.
Transport wind WSW to WNW at 10 - 18 mph.
Surface wind WSW to WNW at 9 - 15 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind SSW to W at 6 - 12 mph.
Surface wind SSW to WSW at 6 - 10 mph.

EVENING
Mixing height 2300 - 3300 ft.
Transport wind SSW to W at 6 - 12 mph.
Surface wind SSW to WSW at 6 - 10 mph.

OUTLOOK:

WEDNESDAY
In the north mixing height 2400 to 3400 ft during the morning rising above 5000 ft during the afternoon.  In the south mixing height 1500 to 2500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 8 - 14 mph.  Surface wind SW to W at 6 - 12 mph.

THURSDAY
Mixing height 1800 to 2800 ft during the morning rising to 4400 to 5000 ft during the afternoon.  Transport wind SSW to W at 6 - 12 mph.  Surface wind light and variable.

FRIDAY
Mixing height 1500 to 2500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 8 - 12 mph.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Tuesday, April 27, 2010.
=================================================================

Coast Range

Zone 601 and 612
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602 and 603
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Units may be 750 tons or less, spaced 5 miles apart, south of the Siuslaw River in Zone 603.

Zone 615 and 620
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  South of T35S in Zone 620 units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 616 west of R8W
Units should be 1200 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 616 east of R9W
Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618
Use standard guidance matrix. (See section 5 below.)

Zone 619
Units should be 2000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Cascades

All zones except zone 611
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Zone 611
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Siskiyous
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

==============================================================
4.  SPECIAL NOTE:

    Call the smoke management duty forecaster at (503) 945-7401 to
    discuss burning.  Please do not call individual's numbers to
    discuss daily burning.  If the forecaster is not available,
    leave a message and he will return your call as soon as possible.
    Avoid calling between 2 to 2:30 p.m.

    The forecast is available on the Internet at:
      http://oregon.gov/ODF/FIRE/fire.shtml/#Smoke_Management

    Please ensure your units have been planned and accomplished by checking:
      http://oregon.gov/ODF/FIRE/SMP/dailysmoke.shtml

5.  STANDARD GUIDANCE MATRIX:

  * Greater than 5000 ft mixing height:  No burning within 5 miles of
    downwind SSRA.  Maximum 100 tons per mile from downwind SSRA.
    Example:  500 ton maximum allowed if burned 5 miles from downwind SSRA.

  * 3000 - 5000 ft mixing height:  No burning within 10 miles of
    downwind SSRA.  Maximum 75 tons per mile from downwind SSRA.
    Example:  750 ton maximum allowed if burned 10 miles from downwind SSRA.

  * Less than 3000 ft mixing height:  No burning within 15 miles of
    downwind SSRA.  Maximum 50 tons per mile from downwind SSRA.
    Example:  750 ton maximum allowed if burned 15 miles from downwind SSRA.

  * All exceptions must be coordinated with the duty forecaster
    prior to ignition.

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